stuart



(No Model.) 2 Sheets-Sheet 1. P. STUART.

GOMPOSITE PAVEMENT. No. 269,480. Patented Dec. 19, 1882.

Jzyl.

N. PETERS. Pnowumognpner. wuingmn, 0.a.

2 Sheets-Sheet 2..

(No Model.)

l P. STUART.

GOMPQSITE PAVEMENT.

Patented Deo. 19, 1882.

I ,[71 veia-for j) N. PETERS. Pnnwumcgmphcn wnhingem4 D. c

UNITED STATES PATENT OFFICE.

PETER STUART, OF EDINBURGH, COUNTY OF MID-LOTHIAN, SCOTLAND.

COMPOSlTE PAVEMENT.

SPECIFICATION forming part of Letters Patent No. 269,480, dated December19, 1882.

' Application filed May 22, 1882. (No model.) l

To all whom it may concern:

Be it known that I, PETER STUART, a citizen of the United Kingdom ofGreat Britain and Ireland, residing at Edinburgh, in the county ofMid-Lothian, Scotland, have. invented a new and useful Improvement inComposite Pavement,ot' which the following isa specitic-ation.

My improvement is especially, though not exclusively, intended forapplication to sidewalks; and it consists in the formation in thesuri'a'cc ot' pavements of depressions of such a character that instepping'thereon the pressnreot the feet will expel the air, causingapartial vacuum, which, supplementing the mechanical ei'ect of theronghened surface, will operate to afford an additional hold to the feetand prevent slipping. This beneficial et'- fect is greater when thepavement is wet, at which time pavements as ordinarily constructed withsmooth or grooved surfaces are more than usually slippery.

In the accompanying. drawings, Figure l is a plan view 0f asection ofpavement illustrating my invention. Fig. 2 isa vertical section of thesaine.

A represents blocks of pavement-such, for example, as described inLetters Patent of the United States No. 248,526, granted to me the 18thof October, 1881, and No. 259,059, the 6th of June, 1882.

B B represent pits or depressions, .which I prefer to form rectangularon .the upper surface and tapering downward to points, thus constitutinginverted pyramids. They may, if preferred, he of round oranyother formwhich adapts them to operate in the manner dcscribed; but they mustnecessarily be of limited area, preferably not more than onefourth inchin diameter, and must be of substantially even or level margin, andwithout grooves or extensions, which would permit thepassage of air whenthe top of the aperture is covered hy the foot. They are preferably notmore than half an inch apart, so that a number of them may be under thesole of the foot at once; but of course the invention -is notlimited toa spectic distance, so long as they are sufficiently near to have theeffect described.

Thisinvention is applicableto artificial stone of' all kinds, and toasphaltand allother kinds of plastic or composite pavements.

Havingthus described myinventiomthe followingis what 1 claim as newtherein and desire to secure by Letters Patent- A composite pavementformed With circular, square, or analogous depressions of equal ornearly equal diameter in each direction, and

with even or level margin on the pavement surface, to adapt theiu tooperateiu the manner. described.y

PETER STUART. Witnesses:

OcTAvIUs KNIGHT, HARRY E. KNIGHT.

